Konica Minolta bizhub C658 Service Manual page 1641

bizhub C658/C558/C458/C368/C308/C258
Step Section
5 2nd transfer section
6 2nd transfer section
7 2nd transfer section
8 Fusing unit
9 Service Mode -> Initialize
+ Image Stabilization
16.3.7 Faint image, low image density (ID lowering)
(1) Typical faulty images
The arrow in the exemplary image troubles indicates the paper feeding direction.
(2) Initial troubleshooting procedure
Step Section
1 Malfunction code
2 Paper Setting
3 Damp paper
4 IDC sensor
5 Service Mode ->
Stabilizer
6 Service Mode ->
Gradation Adjust
7 Image check
Check item
Dirt or foreign matter on the 2nd transfer roller.
Faulty pressure/retraction operation of the 2nd transfer
roller.
There is a positive contact between the application
terminals of the 2nd transfer and the connection
terminals (T2, E) and ground terminal of the high
voltage unit.
There is dirty or foreign matter on paper path of fusing
unit.
Select [Service Mode] -> [Imaging Process Adjustment]
-> [Stabilizer] -> [Initialize + Image
[Gradation Adjust], and the image trouble is eliminated.
Check item
The maintenance call mark is displayed on the panel.
The paper to be used for printing does not match the
paper type and size of paper setting selected on the
machine.
Paper is damp.
• IDC sensor is dirty.
• IDC sensor shutter does not operate properly.
Select [Service Mode] -> [Imaging Process Adjustment]
-> [Stabilizer] -> [Stabilization
trouble is eliminated.
Select [Service Mode] -> [Imaging Process Adjustment]
-> [Gradation Adjust] and the image trouble is
eliminated.
• Select [Service Mode] -> [Test Mode] ->
Pattern]. Select "SINGLE", "HYPER", "Gradation",
"1-Sided", "4 Color", "Full Bleed", and "12
gradations", and load tray 2 with A3 paper. Press
the start key. This runs a print cycle for C, M, Y,
and K in that order.
• Check the image after printing to determine which
color causes the abnormal image.
K-313
K TROUBLESHOOTING > 16. IMAGE QUALITY PROBLEM
Result
YES
YES
NO
YES
YES
Stabilization] and
NO
Result
YES
YES
YES
YES
NO
Only] and the image
NO
[Gradation 1 to 3
colors
colors
Not
availab
Action
• Remove the foreign matter.
• Replace the transfer roller
unit. (bizhub C368/C308/
C258 / bizhub C658/C558/
C458)
• Correct.
• Replace the transfer roller
unit. (bizhub C368/C308/
C258 / bizhub C658/C558/
C458)
Clean or correct the terminal.
Clean. (Disassembling the fusing
unit is prohibited.)
Readjust.
• Replace the fusing unit.
(bizhub C368/C308/C258
bizhub C658/C558
C458)
• Replace the high voltage
unit. (bizhub C368/C308/
C258 / bizhub C658/C558/
C458)
• Replace the MFP board.
(bizhub C368/C308/C258
bizhub C658/C558/C458)
Action
Perform the relevant
troubleshooting procedure
corresponding to the malfunction
code.
Make the paper setting again on
the machine.
Change paper to one just
unwrapped from its package.
• Clean.
• Clean or correct the IDC
sensor shutter.
Go to the next step.
Go to the next step.
Go to the 1-color troubleshooting
procedure.
4 Go to the 4-color troubleshooting
procedure.
Go to scanner troubleshooting
procedure.
le
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/ bizhub
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